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Actually 0.200" is what's considered minimum for a major thrust in the rest of the old stuff. For Mopar engines if you can get 0.170" on a major thrust it's going to work. And the non-thrust parts of the block can go all the way to 0.120" and some won't even make that, and I mean virgin blocks! If you have 0.170" or more on all thrusts you go out and buy lottery tickets!
I have a 360 block that's .250" minimum on all thrusts at standard bore but my lottery tickets aren't so good. It's from '82, or '84 I believe. I also have a 440 block with similar numbers from '76 or '77 I think.
As for the thousands of 600hp 360s out there, I think they're all out racing those fabled 383 Hemis that Gramps had in his Road Runner. Put another way I don't believe it. If there are 100 360s making 600hp I'd be surprised.
A friend had one last year until an H-beam snapped in half. Block was probably still usable, heads were fine, crank was repairable, camshaft even survived!
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